Personally speaking,I think the HX2's are the best design that RF has ever desighned. They handle power,and keep theyre value over time.Much better in my opinion than the new stuff.Maybe too good!
You have to watch out for the broken tinsle leads.Great mix of SQ and SPL by RF.Sensitivty is marginal.Works well in a variety of enclosure.
Great buy if you can find them in good shape.Make sure you inspect the tensil lead,use a lamp or flashlight to make sure the voice coil isn't abused. If you find them with a cracked dust-cap your on borrowed time,it will get worse and annoyying.

Lacks dynamics,when compared to other subwoofer in its new price range. But a good R&B,Rap,Reggae,Techno,subwoofer.